What is the structure in a cell that is responsible for chemical reactions?

Answer 1

All of them. Chemical reactions are the basis of life. The reations that breakdown food to create energy occur in the mitochondria in animals or in the chloroplast and mitochondria in plants.

Answer 2

There is no one strucutre in a cell that is responsible. Chemical reactions occur constantly in every part of the cell. Enzymes are proteins that stimulate chemical reactions and provide binding surfaces to speed up the process.